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代码是C2000Ware中的led_ex1_blinky.c，DSP上电后发现XRSN引脚被内部自动脉冲式下拉，下拉时间间隔15ms,下拉图形：
测量外部晶体X1引脚与GND间的电压波形：
请问此问题是什么原因导致的？
